Climate deniers is a very unfortunate term. It is a derogatory term, used to equate people who don't accept global warming theories with Holocaust denial. You can think that climate sceptics are bad people but it is unfair, dishonest, irresponsible and distasteful to compare the industrial slaughter of human beings to global warming.
It's also a few reasons to deny the Holocaust, but the main one is that the denier is a convinced Nazi or Fascist. To make that comparison is also unfair, dishonest, irresponsible and distasteful. In short you are a bad human being if you use the term ‘climate denier’ because you belittle a horrible crime against humanity, and call people Fascists. Shame on you.
Climate sceptics are not the problem. They do their part in the scientific model. You are supposed to be critical, and if a theory is valid. Then it doesn't need anyone to defend it.
The problem is with the Religion of Science. People who believe in anything a scientist says, as if he was a Prophet speaking the word of God Himself. That motivates non-scientists to adopt scientific methods and pose as scientists to get funding, and to be taken seriously. This is definitely not a new phenomenon, it has been going on since the 19th century. Whole academic circles have grown up posing as scientists, and misleading people.
This problem only got worse as political thinkers began to say that their works were scientific. A notable example is Marx, who poses as an economist, and historian. His economics were taken wholesale from Ricardo, and there was no scientific evidence for any of his historical theories. Still many modern historians are still Marxist in their outlook. This politicizing of science further undermined science in the Age of Propaganda starting before WWI. Science was abused to convince people to keep fighting. The enemy was portrayed as non-human. Science, news, poetry and art became very untrustworthy since they became propaganda. First in the service of the empires, then to nationalism and ideologies.
After the wars, the cold War didn't make the problem go away. War on drugs, war on poverty, war on pollution, war on racism, war on terrorism, war on disease, war on pests, war on discrimination, war on masculinity, war on smoking, war on drinking, war on global warming… when the solution to a particular war is Socialism. It tends to make non-Socialists sceptical. When we are told to accept anything as truth, and to not ask questions or be sceptical. Then we should all be sceptical.
When we look at the history of environmentalism. Many of their causes have later been shown to be counterproductive, or conclusions based on limited of flawed evidence. Another problem is that a political system is not equipped to make distinction between good or bad science. Popular opinion is not any indication of validity either, so even popular theories are likely to be wrong. Racism was universally accepted as fact in the late 19th century. Now it isn't possible to examine the topic without being called an apologist for Nazism.
So if the government, or international community of states are to do anything, they are likely to do the wrong thing. They cannot back whatever measures which is threatening to the status quo of the international power balance. So they won't back nuclear power, because they can be used to enrich material for nuclear weapons. Environmentalists do not push the agenda either, which leads me to suspect they don't really believe their own theories either.
Environmentalism is also anti-Capitalism, but usually what is good for free markets, is what is best in terms of pollution, and for the global environment. People who really care about the environment wants people to be self sustained, short travel of goods and are anti-competition. They usually only care about their immediate surroundings.
If I ask someone to explain to me why I should believe in their theories. I'm just told nonsense that isn't scientific at all. I assume because most people who are convinced don't understand it. But I want to understand before I believe in a theory. And if I don't, and the theory is right. Then there should be no threat to the science. Since science is not based on faith, but on being critical.
What do I need to believe? More science, less politics, less people blindly accepting anything they are told, and more actual real world solutions.